Having the same boundaries or limits; sharing the same endpoint or terminal point; ending at the same location.
From co- plus terminal (from Latin 'terminus' meaning boundary or end). Used in geometry, geography, and administration to describe things that share exactly the same limits.
In geometry, coterminal angles blow students' minds—a 90-degree angle and a 450-degree angle are coterminal because they both point to the same spot, just with different numbers of spins!
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